title: Si₃N₄ ring resonator-based microwave photonic notch filter with an ultrahigh peak rejection.
abstract: We report a simple technique in microwave photonic (MWP) signal processing that allows the use of an optical filter with a shallow notch to exhibit a microwave notch filter with anomalously high rejection level. We implement this technique using a low-loss, tunable Si₃N₄ optical ring resonator as the optical filter, and achieved an MWP notch filter with an ultra-high peak rejection > 60 dB, a tunable high resolution bandwidth of 247-840 MHz, and notch frequency tuning of 2-8 GHz. To our knowledge, this is a record combined peak rejection and resolution for an integrated MWP filter.
authors.forename: David
authors.initials: D
authors.lastname: Marpaung
authors.forename: Blair
authors.initials: B
authors.lastname: Morrison
authors.forename: Ravi
authors.initials: R
authors.lastname: Pant
authors.forename: Chris
authors.initials: C
authors.lastname: Roeloffzen
authors.forename: Arne
authors.initials: A
authors.lastname: Leinse
authors.forename: Marcel
authors.initials: M
authors.lastname: Hoekman
authors.forename: Rene
authors.initials: R
authors.lastname: Heideman
authors.forename: Benjamin J
authors.initials: BJ
authors.lastname: Eggleton